prophylactic

(noun) remedy that prevents or slows the course of an illness or disease. Synonyms: preventive, preventative. Examples: "The doctor recommended several preventatives."

(noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse. Synonyms: condom, rubber, safety, safe.

(adj) capable of preventing conception or impregnation. Synonyms: contraceptive, antifertility. Examples: "Contraceptive devices and medications."

(adj) warding off. Synonyms: cautionary. Examples: "The swastika...a very ancient prophylactic symbol occurring among all peoples"- victor schultze."

(adj) preventing or contributing to the prevention of disease. Synonyms: preventive, preventative. Examples: "Preventive medicine." "Vaccines are prophylactic." "A prophylactic drug."